Integrated, Precision Battery Sensor for Automotive Systems
Product Details
The ADuCM331 is a fully integrated, 8 kSPS, data acquisition system that incorporates dual, high performance multichannel sigma-delta Σ-Δ ADCs, 32-bit ARM® Cortex™-M3 processor and flash. The ADuCM331 has 128 kB program flash. and 4 kB data flash. The ADuCM331 is a complete system solution for battery monitoring in 12 V automotive applications. The ADuCM331 integrates all of the required features to precisely and intelligently monitor, process, and diagnose 12 V battery parameters including battery current, voltage, and temperature over a wide range of operating conditions.
Minimizing external system components, the device is powered directly from a 12 V battery. On-chip, low dropout LDO regulators generate the supply voltage for two integrated Σ-Δ ADCs. The ADCs precisely measure battery current, voltage, and temperature to characterize the state of the health and the charge of the car battery.
The device operates from an on chip, 16.384 MHz high frequency oscillator that supplies the system clock. This clock is routed through a programmable clock divider from which the core clock operating frequency is generated. The device also contains a 32 kHz oscillator for low power operation.
The analog subsystem consists of an ADC with a programmable gain amplifier PGA that allows the monitoring of various current and voltage ranges. It also includes a precision reference on-chip. The ADuCM331 integrates a range of on-chip peripherals that can be configured under core software control as required in the application. These peripherals include a SPI serial input/output communication controller, six GPIO pins, one general-purpose timer, a wake-up timer, and a watchdog timer. The ADuCM331 is specifically designed to operate in battery-powered applications where low power operation is critical. The microcontroller core can be configured in normal operating mode, resulting in an overall system current consumption of <18.5 mA when all peripherals are active. The device can also be configured in a number of low power operating modes under direct program control, consuming <100 µA. The ADuCM331 also includes a LIN physical interface for single wire, high voltage communications in automotive environments.
The device operates from an external 3.6 V to 18 V on VDD, Pin 26 voltage supply and is specified over the −40°C to +115°C temperature range, with additional typical specifications at +125°C.
**APPLICATIONS **
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- Battery sensing/management for automotive and light mobility vehicles
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- Lead-acid battery measurement for power supplies in industrial and medical domains
### Features and Benefits
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- High precision analog-to-digital converters ADCs
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- Dual channel, simultaneous sampling
I-ADC 20-bit Σ-Δ minimizes range switching
VADC//TADC 20-bit Σ-Δ
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- Programmable ADC conversion rate from 1 Hz to 8 kHz
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- On-chip ±5 ppm/°C voltage reference
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- Current channel
Fully differential, buffered input
Programmable gain from 4 to 512
ADC absolute input range: −200 mV to +300 mV
Digital comparator with current accumulator feature
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- Voltage channel
Buffered, on-chip attenuator for 12 V battery input
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- Temperature channel
External and on-chip temperature sensor options
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- Microcontroller
ARM Cortex-M3 32-bit processor
16.384 MHz precision oscillator with 1% accuracy
Serial wire download SWD port supporting code download and debug
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- Automotive qualified integrated local interconnect network LIN transceiver
LIN 2.2-compatible slave, 100 kb fast download option
SAE J-2602 compatible slave
Low electromagnetic emissions EME
High electromagnetic immunity EMI
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- See data sheet for additional features
